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Spotted Swamp Eel - (Synbranchus marmoratus)

Spotted Swamp Eel - (Synbranchus marmoratus)

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Spotted Swamp Eel - (Synbranchus marmoratus)
Fish Details, Description and Information Below:

🐟 Spotted Swamp Eel – (Synbranchus marmoratus) – Elongated, Air-Breathing Freshwater Predator

The Spotted Swamp Eel (Synbranchus marmoratus) is a fascinating, elongated fish species native to the warm freshwater swamps, marshes, and slow-moving rivers of Central and South America. Recognized by its mottled, spotted pattern and snake-like body, this species is both an opportunistic predator and an air-breather, able to survive in low-oxygen waters where many other fish cannot. Its hardy nature and unique appearance make it a standout for specialized aquariums.


🔎 Quick Facts – Spotted Swamp Eel (Synbranchus marmoratus)

  • 📛 Common Names: Spotted Swamp Eel, Marbled Swamp Eel
  • 🔬 Scientific Name: Synbranchus marmoratus
  • 🌍 Origin: Central and South America – found in swamps, marshes, and slow-moving rivers
  • 🎨 Appearance: Long, cylindrical, snake-like body with mottled dark brown/black and golden spots
  • 📏 Max Size: 30–40 inches (76–102 cm)
  • 💎 Rarity: Occasionally seen in the aquarium trade

😇 Behavior & Temperament

  • 🐟 Nocturnal and secretive—often hides during the day
  • ⚠️ Opportunistic predator—will eat smaller fish, crustaceans, and worms
  • 🪵 Burrows in substrate or hides in tight spaces
  • 🌬️ Air-breathing—can survive in low-oxygen water for extended periods
  • 🤝 Best kept alone or with very large, fast tankmates

🏠 Aquarium & Tank Requirements

  • 📦 Minimum Tank Size: 100+ gallons
  • 🌿 Fine sand or soft substrate for burrowing
  • 🪵 Provide PVC tubes, caves, and driftwood for hiding
  • 💡 Low to moderate lighting preferred
  • 🌊 Slow to moderate flow—mimic swampy or sluggish waters
  • 🔒 Tight-fitting lid—excellent escape artist

💧 Water Parameters – Spotted Swamp Eel Care

  • 🌡️ Temperature: 75–82°F (24–28°C)
  • ⚗️ pH: 6.5–7.5
  • 💧 Hardness: Soft to moderately hard

🍽️ Diet – Carnivorous

  • 🐟 Live or frozen fish, shrimp, and worms
  • 🦐 Pieces of prawn, squid, or mussels
  • 🪱 Earthworms and bloodworms
  • ⚠️ Prefers meaty foods and will hunt at night

📋 Spotted Swamp Eel Care Overview Table

Feature Details
🌍 Origin Central & South America
📏 Max Size 30–40 inches
😇 Temperament Nocturnal predator
🏠 Tank Size 100+ gallons
⚗️ pH Range 6.5–7.5
🌡️ Temperature 75–82°F
🍽️ Diet Carnivorous – fish, shrimp, worms
🎯 Ideal For Large predator setups, species tanks

✨ Highlight:

  • The Spotted Swamp Eel is a hardy, unusual predator capable of breathing air and surviving in extreme conditions, making it a fascinating addition for advanced keepers who appreciate unique, snake-like fish.
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